Simultaneous Achievement of Large Negative Dispersion and High Birefringence in the Single-mode Photonic Crystal Fibers with Hexagonal Double Cladding

The article designs a novel hexagonal double cladding photonic crystal fiber with the inner-cladding elliptical hole. A large negative dispersion of -1068.78 ps/nm/km and high birefringence of 1.01×10-2 are achieved at 1.55 μm.